Chapter 6 - Materials Property charts and Material Indices

Question 1

Young Modulus (E) and Density (p)

Answer 1

This chart guides selection of materials for light and stiff components.

Question 2

Strength against Mass density

Answer 2

This is the chart for designing light and strong structures. The strength for metals is the 0.2% offset yield strength.

Question 3

Young Modulus against Strength

Answer 3

The chart for elastic design.
Applications:
- Selection of materials for springs
- Elastic Hinges
- Pivots and elastic bearings
- Yield-beforebuclking design

Question 4

Specific modulus against Specific Strength

Answer 4

The chart for specific stiffness and strength
Applications:
- Minimum weigth design of ties and springs
- Design of rotating components to maximize rotational speed or energy storage.

Question 5

Fracture toughness against Young Modulus

Answer 5

The chart displays both the fracture toughness Kic, and the toughness.

It allows criteria for stress and displacement limited failure criteria to be compared.

Question 6

Fracture toughness against Strength

Answer 6

The chart for safe design against fracture.
Applications:
- The chart guides selection of materials to meet yield-before break design criteria, in assessing plastic or process-zone sizes
- In designing samples for valid fracture toughness testing.

Question 7

Loss coefficient against Young’s modulus

Answer 7

The chart gives guidance in selecting material for low damping and for high damping.

Question 8

Thermal conductivity against Electrical Conductivity

Answer 8

This is the chart for exploring thermal and electrical conductivities.

Question 9

Thermal Conductivity against Thermal Diffusivity

Answer 9

The chart guides in selecting materials for thermal insulation

Question 10

Thermal expansion coefficient against Thermal conductivity

Answer 10

The chart for assessing thermal distortion.

Question 11

Linear thermal expansion against Young modulus

Answer 11

The chart guides in selecting materials when thermal stress is important

Question 12

Strength against Maximum service temperature

Answer 12

The chart gives a birds-eye view of the regimes of stress and temperature in which each material class, and material, is usable.

Question 13

Coefficient of friction

Answer 13

When two surfaces are placed in contact under a normal load and one is made to slide over the other a force opposes the motion.